| Blyth to Smolyan | 1,509.18 mi (2,428.80 km) |
| Blyth to Sofia | 1,404.90 mi (2,260.96 km) |
| Blyth to Sopot | 1,457.67 mi (2,345.89 km) |
| Blyth to Sozopol | 1,575.90 mi (2,536.17 km) |
| Blyth to Sredets | 1,560.80 mi (2,511.87 km) |
| Blyth to Stamboliyski | 1,475.60 mi (2,374.75 km) |
| Blyth to Stara Zagora | 1,500.56 mi (2,414.92 km) |
| Blyth to Svilengrad | 1,553.18 mi (2,499.61 km) |
| Blyth to Svishtov | 1,432.74 mi (2,305.77 km) |
| Blyth to Targovishte | 1,495.23 mi (2,406.34 km) |
| Blyth to Teteven | 1,427.33 mi (2,297.06 km) |
| Blyth to Troyan | 1,445.05 mi (2,325.59 km) |
| Blyth to Tryavna | 1,474.05 mi (2,372.25 km) |
| Blyth to Tutrakan | 1,459.24 mi (2,348.41 km) |
| Blyth to Varna | 1,546.07 mi (2,488.16 km) |
